Frequencies for first 10,000 rows of nlbnd variable in natlterr1997 dataset :

  Number of |
Live Births |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,860       98.60       98.60
          1 |        120        1.20       99.80
          2 |         15        0.15       99.95
          3 |          3        0.03       99.98
          5 |          1        0.01       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015